Make it possible to build cronet without icu.

net/net.gypi

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This file is shared between the regular GYP build, the NaCl GYP build, and
 # the GN build. For GN support, it must have no conditionals or anything like
 # that beyond the simple one-level-deep dictionary of values.
 {
   'variables': {
     # Subset of net source files that are compiled for NaCl (net_nacl target).
@@ skipping 1232 matching lines @@
       'base/int128_unittest.cc',
       'base/ip_endpoint_unittest.cc',
       'base/ip_pattern_unittest.cc',
       'base/keygen_handler_unittest.cc',
       'base/mime_sniffer_unittest.cc',
       'base/mime_util_unittest.cc',
       'base/net_log_logger_unittest.cc',
       'base/net_log_unittest.cc',
       'base/net_log_unittest.h',
       'base/net_util_unittest.cc',
+      'base/net_util_icu_unittest.cc',
       'base/network_change_notifier_win_unittest.cc',
       'base/prioritized_dispatcher_unittest.cc',
       'base/priority_queue_unittest.cc',
       'base/registry_controlled_domains/registry_controlled_domain_unittest.cc',
       'base/sdch_manager_unittest.cc',
       'base/static_cookie_policy_unittest.cc',
       'base/test_completion_callback_unittest.cc',
       'base/upload_bytes_element_reader_unittest.cc',
       'base/upload_data_stream_unittest.cc',
       'base/upload_file_element_reader_unittest.cc',
@@ skipping 442 matching lines @@
       'tools/quic/test_tools/quic_test_client.h',
       'tools/quic/test_tools/quic_test_utils.cc',
       'tools/quic/test_tools/quic_test_utils.h',
       'tools/quic/test_tools/server_thread.h',
       'tools/quic/test_tools/server_thread.cc',
       'tools/quic/test_tools/simple_client.h',
       'tools/quic/test_tools/simple_client.cc',
     ],
   }
 }